Knob



FIG. 1 is a perspective view of a knob showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a right side elevational view thereof, and,

FIG. 7 is a left side elevational view thereof. 

The ornamental design for a knob, as shown and described. 